69 Works

Untersuchung von Werkstoffen für die Katalyse mit Elektronentomographie - Investigation of materials for catalysis with electron tomography

Roman Grothausmann

E6 - Focusing Powder Diffractometer

Helmholtz-Zentrum Berlin Für Materialien Und Energie
E6 uses a horizontally and vertically bent monochromator [1] and an in-pile fan collimator [2, 3]. The fan collimator imitats a vertical slit with adjustable distance to the monochromator. This diffraction geometry achieves a focusing in reciprocal space. At medium resolution, the neutron flux is increased by a factor of two compared with diffractometers that use standard Soller collimators.

V16 - Very Small Angle Neutron Scattering (VSANS)

Helmholtz-Zentrum Berlin Für Materialien Und Energie
The second SANS instrument at BER II is dedicated to soft matter research. V16 covers a Q-range from 10-3 nm-1 to 8.5 nm-1. In standard time-of-flight mode an offset of the detector to the instrument axis to extend the Q range will be possible.

Herstellung und thermo-physikalische Charakterisierung von superionischen Gläsern basierend auf dem AgPO3-System

Sana Qayyum
diploma thesis

E2 - Flat-Cone Diffractometer

Helmholtz-Zentrum Berlin Für Materialien Und Energie
A 3-dimensional part of the reciprocal space can be scanned in less then five steps by combining the “off-plane Bragg-scattering” and the flat-cone layer concept while using a new computer-controlled tilting axis of the detector bank. Parasitic scattering from cryostat or furnace walls is reduced by an oscillating "radial" collimator. The datasets and all connected information is stored in one independent NeXus file format for each measurement and can be easily archived. The software package...

Effizienzlimitierende Rekombinationsprozesse in amorph/kristallinen und polykristallinen Siliziumsolarzellen

Caspar Leendertz
PhD thesis

E9 - Fine Resolution Powder Diffractometer (FIREPOD)

Helmholtz-Zentrum Berlin Für Materialien Und Energie
The Fine Resolution Powder Diffractometer E9 (FIREPOD) is an angle-dispersive powder diffractometer optimized for a flat resolution function with a minimum width of the reflections at the 2Θ-region with the highest density of reflections. The monochromator is placed at a distance of 11 m from the reactor core, which allows for a large take-off angle at the monochromator. An evacuated beam tube and a sapphire single crystal filter reduce air scattering and epithermal neutrons. Neutron...

Neutron Scattering Investigations on 3d and 4f Frustrated Magnetic Insulators

Diana Lucía Quintero Castro
PhD thesis

UE52_PGM Nano cluster trap

Helmholtz-Zentrum Berlin Für Materialien Und Energie
UE52 PGM nanocluster trap is a soft x-ray beamline at BESSY II that delivers an unfocussed low-divergence beam of variable polarization. Its characteristics are ideally suited for ion trap studies of magnetic properties.

V18 - Reflectometer for biological applications (BioRef)

Helmholtz-Zentrum Berlin Für Materialien Und Energie
BioRef is a time-of-flight reflectometer which is intended to focus on soft matter applications, especially at solid–liquid interfaces, for the investigation of biological model systems under physiological conditions including kinetic studies. The instrument was built in a joint collaboration between HZB and the University of Heidelberg with financial support by the BMBF Verbundforschung. Unique features of BioRef are the chopper system, which allows for focusing on a certain Q-range in order to support fast kinetic...

V4 - Small Angle Scattering Instrument (SANS)

Helmholtz-Zentrum Berlin Für Materialien Und Energie
V4 allows for the measurement of density composition and magnetization fluctuations in materials on a length scale from 0.5 nm to 400 nm. At short distance the 2D-detector can be moved vertically by 0.17 m, extending the Q range to even higher values. A large sample chamber is connected to the vacuum system with the detector and collimator tubes. Automatic sample changers (both T and B controlled) are available.

V6 - Reflectometer

Helmholtz-Zentrum Berlin Für Materialien Und Energie
The reflectometer V6 allows measuring the neutron optical reflectivities on flat surfaces at grazing angles. The reflectivity is related to the variation of the refractive index within a depth of about 200 nm, thus structural depth profiles can be studied at solid-air, solid-liquid and free liquid surfaces.

V7 - Cold Neutron Tomography and Radiography (CONRAD)

Helmholtz-Zentrum Berlin Für Materialien Und Energie
The neutron tomography beam line V7 was designed with two measuring positions: the first one is located directly at the end of the neutron guide, where a very high neutron flux is available but the image resolution is limited due to the beam divergence. The second measuring position uses a pin-hole geometry followed by more than 5m of flight tube in order to gain a high collimation ratio and image resolution. The high-flux measuring position...

V3 - Time-of-Flight Spectrometer (NEAT)

Helmholtz-Zentrum Berlin Für Materialien Und Energie
The neutron time-of-flight spectrometer NEAT has a long history of successful applications in the study of dynamics and function of materials. It is best suited to probe dynamic phenomena directly in space and time in the large time domain 10-14 – 10-10 s and on the length scale ranging from 0.05 to up to about 5 nm. To address user community needs for more powerful instrumental capabilities, a concept of full upgrade of NEAT has...

V1 - Membrane Diffractometer

Helmholtz-Zentrum Berlin Für Materialien Und Energie
The design of the instrument is dedicated for biological samples or other samples with large unit cells (5-10 nm in cell length). The vertically focusing graphite monochromator provides adjustable wavelengths between 0.4 nm and 0.6 nm, making use of the full cross section of the neutron guide (3 cm wide, 12.5 cm high). A movable Be-filter at liquid nitrogen temperature may be used to suppress second order wavelengths below 0.39 nm. If less stringent collimation...

E4 - 2-Axis-Diffractometer

Helmholtz-Zentrum Berlin Für Materialien Und Energie
The instrument is primarily suited for magnetic structure determination under various conditions, which includes magnetic fields up to 17 T, temperatures down to 30 mK and pressures up to 10 kbar. The most common application is to reveal spatial arrangement ordered spin structures. Using the polarized neutrons option facilitates the separation of magnetic contributions from nuclear scattering. The measurement of flipping ratios allows registration of very weak magnetic scattering and the mapping of spin density...

E3 - Residual Stress Analysis and Texture Diffractometer

Helmholtz-Zentrum Berlin Für Materialien Und Energie
The diffractometer is designed for strain and stress analysis for simple geometric samples as well as for industrial applications and heavy components of arbitrary shape. The diffractometer itself consists of two big omega circles (Ω and 2Θ) with a diameter of 800 mm and upon a translation table (xyz-direction) for sample positioning in vertical and horizontal direction. This set up is installed for handling heavy and/or large samples and components such as impellers or turbines...

HFM/EXED - High Magnetic Field Facility for Neutron Scattering

Helmholtz-Zentrum Berlin Für Materialien Und Energie
High Magnetic Field Facility for Neutron Scattering consists of two main components: the High Field Magnet (HFM) and the Extreme Environment Diffractometer (EXED). The former is a dedicated 26 T hybrid magnet, built by the HZB in collaboration with the National High Magnetic Field Laboratory (Florida, US). The latter is a time-of-flight instrument optimized for neutron scattering in restricted angular geometry of the magnet.

E11 - Fast Acquisition Laue Camera for Neutrons (FALCON)

Helmholtz-Zentrum Berlin Für Materialien Und Energie
Neutron Laue diffraction is an important method of neutron scattering for measuring single crystals. Laue diffraction patterns are generated in a matter of seconds from very small crystals i.e. <1mm3. FALCON has two scintillating plate detectors coupled to four iCCD cameras each, to produce a 2D projection of a large volume of reciprocal space in a single Laue pattern. Such images can be used to index complex crystal structures, characterise features such as twinning or...

V2 - Cold Neutron 3-Axis Spectrometer (FLEXX)

Helmholtz-Zentrum Berlin Für Materialien Und Energie
The instrument name is derived from the flexibility of the spectrometer parameters which permit non-standard experiments and its use in the development of novel methods. The instrument was upgraded in 2011 and rechristened FLEXX. Its new position at the end of the NL1B guide allows a large coverage in wavevector transfer. The guide itself has been upgraded with m=3 neutron supermirrors to allow more neutrons to be transported from the source to the instrument. In...

Local Structure of Al-based Amorphous Alloys after Microalloying by Element Substitution and after Ball Milling

Yao Liu
PhD thesis

Hydrogen Passivation of Polycrystalline Si Thin Film Solar Cells

Benjamin Gorka

Strukturelle Charakterisierung von Wasserstoff trennenden Gasseparationsmembranen auf Lantanoid-Wolframat-Basis

Tobias Scherb
PhD thesis

Technical Design Study BESSSY VSR

A. Jankowiak, J. Knobloch, P. Goslawski & N. Neumann
technical report

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